This is version 2 of a propeller changing tool I made for my quadcopters and it is designed for 22xx to 28xx size motors (27 to 35 mm in diameter).
It needs to be printed with a lot of walls and top and bottom layers to be really sturdy. The grip inserts I printed in Ninjaflex but other TPUs may work. And obviously you need two of each part.
You will also need a M4 bolt and nut and a two washers. The spring is from a clicky pen, I used two of them.